downwash


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downwash

[′dau̇n‚wäsh]
(fluid mechanics)
The downward deflection of air, relative to the direction of motion of an airfoil.

downwash

downwash
downwashclick for a larger image
downwash
downwash
i. Fluid flow moving at a deflected angle after deflection by helicopter rotors and measured parallel to the disc.
ii. Fluid flow deflected at an angle more perpendicular to the motion of the airfoil, measured in the plane parallel to the plane of symmetry close behind the trailing edge.
iii. Air that has passed around the main wing or rotor and now strikes the tailplane at an angle different from the direction of flight.
iv. Air that has been accelerated downward by the action of the rotors of a helicopter.
References in periodicals archive ?
As we pulled power to arrest our rate of descent to abort the landing, I observed that our rotor downwash had blown freshly cut infield grass over numerous civil aircraft parked on the runway, as well as the crowd that was gathered to see our arrival.
respectively, it was found that a vertical flow pattern behind: he moving object appeals The vertical flow is resulted from Tie interaction between downwash air flow, rebounded flow from the porous perforated-floor, and moving object For Tie case without any particle source in the mini-environment, it was found that particle collected from the top and rear surfaces of moving object are increased with the increase of moving object velocity.
VRS occurs when a rapidly descending helicopter flies through its own downwash and becomes unstable.
In each case, the helicopter descended into rotor downwash and entered what is commonly called the vortex ring state (VRS).
Piasecki has exhibited a model of a smaller navalised Pathfinder IV-2, with high-set wings, hinged spanwise to minimise downwash loads.
Rotorcraft brownouts are intense, blinding dust clouds that result from helicopter rotor downwash, which is the forcing of air downward during the creation of lift from dry, dusty terrain.
It has sophisticated aircraft simulation models, such as the downwash effects of air-to-air refueling.
These lower decks, mainly used by members of ship's company who are not associated with flight operations, contribute plenty of flying debris when they are swept by the downwash of a helicopter rotor.
Under development in Israel by Urban Aeronautics, the Air Mule flight principle is based on a vane control system that allows to vector its rotors' downwash and thus provide superior manoeuvrability while considerably reducing risks to bystanders, since none of its rotary components are directly exposed.
We're running larger, full-vehicle simulations that include complex interactions, like rotor downwash effects and heat transfer models.
But this action put tension on the parachute lanyard, allowing the rotor downwash to partly inflate the chute.